双金属
脱氢
材料科学
纳米材料基催化剂
氢气储存
纳米结构
氢化物
化学工程
氢
催化作用
纳米复合材料
金属间化合物
解吸
混合稀土
纳米技术
金属
吸附
物理化学
纳米颗粒
冶金
合金
有机化学
化学
工程类
作者
Wajid Ali,Xinyang Li,Yuxiao Yang,Na Li,Bo Huang,Chengzhang Wu,Shujiang Ding
标识
DOI:10.1021/acsami.3c05308
摘要
Magnesium hydride (MGH) is a high-capacity and low-cost hydrogen storage material; however, slow kinetic rates, high dehydrogenation temperature, and short cycle life hindered its large-scale applications. We proposed a strategy of designing novel delaminated 3D bimetal MXene (d-TiNbCTx) nanostructure to solve these problems. The on-set dehydrogenation temperature of MGH@d-TiNbCTx composition was reduced to 150 °C, achieving 7.2 wt % of hydrogen releasing capacity within the range of 150–250 °C. This composition absorbed 7.2 wt % hydrogen within 5 min at 200 °C and 5.5 wt % at 30 °C within 2 h, while the desorption capacity (6.0 wt %) was measured at 275 °C within 7 min. After 150 cycles at 250 °C, the 6.5 wt % capacity was retained with negligible loss of hydrogen content. These results were attributed to the catalytic effect of in situ-formed TiH2/NbH2 nanocatalysts, which lead to dissociate the Mg–H bonds and promote of kinetic rates. This unique structure paves great opportunities for designing of highly efficient MGHs/MXene nanocomposites to improve the hydrogen storage performance of MGHs.
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